CA2005665A1 - Communication system capable of improving a speech quality by a pair of pulse producing units - Google Patents

Communication system capable of improving a speech quality by a pair of pulse producing units

Info

Publication number
CA2005665A1
CA2005665A1 CA2005665A CA2005665A CA2005665A1 CA 2005665 A1 CA2005665 A1 CA 2005665A1 CA 2005665 A CA2005665 A CA 2005665A CA 2005665 A CA2005665 A CA 2005665A CA 2005665 A1 CA2005665 A1 CA 2005665A1
Authority
CA
Canada
Prior art keywords
signals
spectrum parameter
sequence
periodicity
pitch parameters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA2005665A
Other languages
French (fr)
Other versions
CA2005665C (en
Inventor
Kazunori Ozawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
NEC Corp
Original Assignee
NEC Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by NEC Corp filed Critical NEC Corp
Publication of CA2005665A1 publication Critical patent/CA2005665A1/en
Application granted granted Critical
Publication of CA2005665C publication Critical patent/CA2005665C/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10L—SPEECH ANALYSIS TECHNIQUES OR SPEECH SYNTHESIS; SPEECH RECOGNITION; SPEECH OR VOICE PROCESSING TECHNIQUES; SPEECH OR AUDIO CODING OR DECODING
    • G10L19/00—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis
    • G10L19/04—Speech or audio signals analysis-synthesis techniques for redundancy reduction, e.g. in vocoders; Coding or decoding of speech or audio signals, using source filter models or psychoacoustic analysis using predictive techniques
    • G10L19/08—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters
    • G10L19/10—Determination or coding of the excitation function; Determination or coding of the long-term prediction parameters the excitation function being a multipulse excitation

Landscapes

  • Engineering & Computer Science (AREA)
  • Computational Linguistics (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Audiology, Speech & Language Pathology (AREA)
  • Human Computer Interaction (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Compression, Expansion, Code Conversion, And Decoders (AREA)
  • Transmission Systems Not Characterized By The Medium Used For Transmission (AREA)

Abstract

Abstract of the Disclosure:

In an encoder device which is for use in combination with a decoder device in a communication system and which encodes a sequence of digital speech signals into a sequence of output signals by the use of a spectrum parameter and pitch parameters, a primary pulse producing unit calculates a first set of prediction excitation multipulses by the use of the spectrum parameter and the pitch parameters with respect to a preselected one of subframes which result from dividing every frames and produces the first set of prediction excitation multipulses and a sequence of primary synthesized signals specified by the first set of prediction excitation multipulses and the spectrum parameter and the pitch parameters. A subtracter substracts the primary synthesized signals from the digital speech signals and produces a sequence of difference signals representative of differences between the primary synthesized signals and the digital speech signals. Supplied with the difference signals, a secondary pulse producing unit calculates a predetermined number of secondary excitation multipulses by the use of the spectrum parameter and the pitch parameters.
Alternatively, the encoder device may comprise a periodicity detector supplied with the spectrum (Abstract of the Disclosure continued) parameter for detecting whether or not periodicity of an impulse response of a synthesis filter determined by the spectrum parameter is higher than a predetermined threshold level. The periodicity detector produces a weighting signal representative of a weighted value when the periodicity is higher than the predetermined threshold level. The spectrum parameter is weighted on production of the weighted signals.
CA002005665A 1989-03-22 1989-12-15 Communication system capable of improving a speech quality by a pair of pulse producing units Expired - Fee Related CA2005665C (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP71203/1989 1989-03-22
JP1071203A JP2903533B2 (en) 1989-03-22 1989-03-22 Audio coding method

Publications (2)

Publication Number Publication Date
CA2005665A1 true CA2005665A1 (en) 1990-09-22
CA2005665C CA2005665C (en) 1994-02-08

Family

ID=13453884

Family Applications (1)

Application Number Title Priority Date Filing Date
CA002005665A Expired - Fee Related CA2005665C (en) 1989-03-22 1989-12-15 Communication system capable of improving a speech quality by a pair of pulse producing units

Country Status (5)

Country Link
US (1) US5027405A (en)
EP (1) EP0390975B1 (en)
JP (1) JP2903533B2 (en)
CA (1) CA2005665C (en)
DE (1) DE68917584T2 (en)

Families Citing this family (17)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA2051304C (en) * 1990-09-18 1996-03-05 Tomohiko Taniguchi Speech coding and decoding system
US6006174A (en) * 1990-10-03 1999-12-21 Interdigital Technology Coporation Multiple impulse excitation speech encoder and decoder
DE69132987T2 (en) * 1990-11-02 2002-08-29 Nec Corp., Tokio/Tokyo Method for coding a speech parameter by transmission of a spectral parameter with a reduced data rate
CA2054849C (en) * 1990-11-02 1996-03-12 Kazunori Ozawa Speech parameter encoding method capable of transmitting a spectrum parameter at a reduced number of bits
US5528723A (en) * 1990-12-28 1996-06-18 Motorola, Inc. Digital speech coder and method utilizing harmonic noise weighting
FR2702590B1 (en) * 1993-03-12 1995-04-28 Dominique Massaloux Device for digital coding and decoding of speech, method for exploring a pseudo-logarithmic dictionary of LTP delays, and method for LTP analysis.
JP2655046B2 (en) * 1993-09-13 1997-09-17 日本電気株式会社 Vector quantizer
US6064962A (en) * 1995-09-14 2000-05-16 Kabushiki Kaisha Toshiba Formant emphasis method and formant emphasis filter device
JP3196595B2 (en) * 1995-09-27 2001-08-06 日本電気株式会社 Audio coding device
JP2778567B2 (en) * 1995-12-23 1998-07-23 日本電気株式会社 Signal encoding apparatus and method
JP4008607B2 (en) * 1999-01-22 2007-11-14 株式会社東芝 Speech encoding / decoding method
US7139700B1 (en) * 1999-09-22 2006-11-21 Texas Instruments Incorporated Hybrid speech coding and system
JP4813796B2 (en) * 2002-09-17 2011-11-09 コーニンクレッカ フィリップス エレクトロニクス エヌ ヴィ Method, storage medium and computer system for synthesizing signals
WO2004051918A1 (en) * 2002-11-27 2004-06-17 Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Watermarking digital representations that have undergone lossy compression
US20050065787A1 (en) * 2003-09-23 2005-03-24 Jacek Stachurski Hybrid speech coding and system
US10373608B2 (en) * 2015-10-22 2019-08-06 Texas Instruments Incorporated Time-based frequency tuning of analog-to-information feature extraction
EP3671741A1 (en) * 2018-12-21 2020-06-24 FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. Audio processor and method for generating a frequency-enhanced audio signal using pulse processing

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4701954A (en) * 1984-03-16 1987-10-20 American Telephone And Telegraph Company, At&T Bell Laboratories Multipulse LPC speech processing arrangement
GB8621932D0 (en) * 1986-09-11 1986-10-15 British Telecomm Speech coding
US4797926A (en) * 1986-09-11 1989-01-10 American Telephone And Telegraph Company, At&T Bell Laboratories Digital speech vocoder
JP2586043B2 (en) * 1987-05-14 1997-02-26 日本電気株式会社 Multi-pulse encoder

Also Published As

Publication number Publication date
US5027405A (en) 1991-06-25
EP0390975A1 (en) 1990-10-10
JPH02249000A (en) 1990-10-04
JP2903533B2 (en) 1999-06-07
DE68917584D1 (en) 1994-09-22
CA2005665C (en) 1994-02-08
EP0390975B1 (en) 1994-08-17
DE68917584T2 (en) 1994-12-15

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